Java Engineer Job Description

About CodeWalnut

CodeWalnut is a boutique SaaS product development startup building cutting-edge enterprise solutions using technologies like React.js, Node.js, Java, and Python. We are seeking a passionate Java Developer to help create building data pipelines and developing RESTful APIs. You will collaborate with cross-functional teams to deliver scalable and high-performance solutions.

Key Responsibilities

• Data Pipeline Development:
  • Design, develop, and maintain ETL pipelines
  • Extract data from various sources (databases, APIs, flat files) and transform it into meaningful insights.
  • Optimize data ingestion, cleansing, and transformation processes.
  • Ensure scalability and performance of data pipelines.
• API Development & Integration:
  • Develop and maintain RESTful APIs
  • Implement CRUD operations, pagination, and error handling.
  • Integrate external APIs for data retrieval and synchronization.
  • Ensure APIs meet security standards.
• Data Processing & Transformation:
  • Use Java Streams and Multithreading for efficient data processing.
  • Write complex SQL queries for data extraction and transformation.
  • Distributed data processing.
• Testing and Deployment:
  • Write unit tests and perform integration testing to validate data pipelines and APIs. Proficiency in creating comprehensive unit test coverage
  • Collaborate with DevOps teams to deploy services using CI/CD pipelines.
  • Ensure optimal performance through profiling and optimization.
• Documentation & Collaboration:
  • Create and maintain technical documentation for APIs and pipelines(eg: Swagger documentation, etc).
  • Collaborate with other data engineers, backend developers, and product managers to understand requirements and deliver quality solutions.

Required Skills and Qualifications

• Experience: 3+ years of Java project development
• Technical Skills:
  • Java and Apache Spark/Apache Kafka
  • Java 8 features (Strong emphasis on Java Streams)
  • RESTful APIs using Spring Boot or Quarkus
  • Apache Spark or Flink for distributed processing
  • Sql and NoSql (mySql, mongodb, redis, etc)
  • ORM
  • API security using JWT authentication, OAuth, Spring security and encryption
  • Need to know how to use SonarQube and SonarLint for code analysis
  • Groovy and Spock test framework.
• Problem Solving:
  • Expertise in catching edge cases
  • Strong error handling capabilities
  • Ability to optimize code performance